Hi All, In tacker project, we are using heat API to create stack. Consider a case where we want to add OS::Heat::AutoScalingGroup in which there are two servers and the desired capacity is set to 2. So internally heat will create two nested stacks and add following resources to it:- child stack1 VDU1 - OS::Nova::Server CP1 - OS::Neutron::Port VDU2 - OS::Nova::Server CP2- OS::Neutron::Port child stack2 VDU1 - OS::Nova::Server CP1 - OS::Neutron::Port VDU2 - OS::Nova::Server CP2- OS::Neutron::Port Now, as part of tacker heal API, we want to heal VDU1 from child stack2. To do this, we will mark the status of the resources from "child stack2" as unhealthy and then update "child stack2" stack. Since VDU1 resource is present in the two nested stacks, I want to keep the nested stack id information in tacker so that after the stack is updated, I can pull physical resource id of the resources from the nested child stack directly. My question is after the stack is created for the first time, will it ever change the nested child stack id? Thank you. Regards, tpatil Disclaimer: This email and any attachments are sent in strictest confidence for the sole use of the addressee and may contain legally privileged, confidential, and proprietary data. If you are not the intended recipient, please advise the sender by replying promptly to this email and then delete and destroy this email and any attachments without any further use, copying or forwarding.